E85, how to pick injector size?
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E85, how to pick injector size?
Okay I've search and read the FAQ already.
But nothing came up that was clear and definative that would answer my questions about injector sizing.
I know how to size injectors : to : horsepower with regular fuel
? but what is the formula or scale to use for sizing injectors : to : horsepower using E85?
I'm sure this would help out all of the up and coming E85 users.
Charlie Moua
But nothing came up that was clear and definative that would answer my questions about injector sizing.
I know how to size injectors : to : horsepower with regular fuel
? but what is the formula or scale to use for sizing injectors : to : horsepower using E85?
I'm sure this would help out all of the up and coming E85 users.
Charlie Moua
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Re: E85, how to pick injector size?
there isn't one that i'm aware of. I was told to get 800cc injectors for my 350whp goals but ended getting 1000cc and maxxed them out at only 377whp @ 9psi. GL
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Re: E85, how to pick injector size?
I use a dartboard and blindfold...
Actually, an easy way to figure the safe max for injectors is 0.6 x CC = whp. This is for four injectors on a Honda, typically nearing 85% duty cycle and a decent turbo setup. So 0.6 x 600cc = 360whp. You'll usually want to go 25-50% higher for more power later.
For E85, you the formula 0.45 x CC = whp works well. You need about 30% more fuel when using E85 vs 93 octane, but make 5-10% more max power. Just remember that counts for idle too, so the max injector size your EMS can control/idle with gasoline can be 30% larger.
Actually, an easy way to figure the safe max for injectors is 0.6 x CC = whp. This is for four injectors on a Honda, typically nearing 85% duty cycle and a decent turbo setup. So 0.6 x 600cc = 360whp. You'll usually want to go 25-50% higher for more power later.
For E85, you the formula 0.45 x CC = whp works well. You need about 30% more fuel when using E85 vs 93 octane, but make 5-10% more max power. Just remember that counts for idle too, so the max injector size your EMS can control/idle with gasoline can be 30% larger.
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Re: E85, how to pick injector size?
must be hella rich lol.
hp is the main thing that limits injector sizing. 880's on e85 ive seen go to 440-480 wheel. but this is with stock/close to stock base fuel pressure. you can always ramp up the base with a fpr and the injectors will flow more.
hp is the main thing that limits injector sizing. 880's on e85 ive seen go to 440-480 wheel. but this is with stock/close to stock base fuel pressure. you can always ramp up the base with a fpr and the injectors will flow more.
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Re: E85, how to pick injector size?
um, correct me if i'm wrong, but does anyone else see something wrong with these numbers?? 1000cc injectors maxed out at 377hp? i think u may possibly be running a lil rich
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Re: E85, how to pick injector size?
yea something doesnt seem right there. im only at 57% duty on my id1000's and im right at about 350 wheel at 11 lbs on a b16.
#9
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Re: E85, how to pick injector size?
If you use this HP calculator and a BSFC of .750, it will give you a pretty good average for E85.
http://www.injectordynamics.com/hors...alculator.html
http://www.injectordynamics.com/hors...alculator.html
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Re: E85, how to pick injector size?
I still don't understand how my fuel system is inadequate...any thoughts on my setup?
-walbro 255
-precision 1000cc
-b&m fpr
-aem fuel rail
-blox fpg (reads 70 psi)
-everything else stock
Last edited by red_EF9Si; 10-28-2009 at 12:13 PM. Reason: typo
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Re: E85, how to pick injector size?
something doesnt seem right. walbro 255 with a 70 base fuel? didnt think they could really support that.
on top of that add 9 psi of boost. making it almost 80 lbs of fuel pressure... :/
on top of that add 9 psi of boost. making it almost 80 lbs of fuel pressure... :/
Last edited by jdm602; 10-28-2009 at 11:44 AM.
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